Tomato late blight occurs when the relative air humidity is between 75% and 100%. At room temperature, the relative humidity in the shed is lower than 75%. Therefore, when the weather is fine, ventilation and dehumidification can be carried out in the evening to reduce the occurrence of late blight by reducing the humidity of the air. In cloudy and rainy days, attention must be paid to closing the air, because the humidity of the outside air is high during rainy days, which will increase the incidence of late blight. . In addition, we must pay attention to the use of Jin Lei 500 times liquid or 25% azoxystrobin 1500 times liquid and other agents for prevention.
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